National Institute of Standards and Technology

Searching for the precise right time? Then step into this unassuming Bauhaus structure and set your watch to the atomic clock, the nation's official timekeeper. Ultimately this educational haven is a place for researchers to develop ways for business, industry, science and government to advance technically. Though most people come to simply take in the tick and tock of the famous clock, the facility does offer a 90-minute guided tour. Self-guided tours are also welcome.